A Brief Introduction to Epidemiology - VII (Epidemiologic Research Designs: Demographic, Mortality & Morbidity Studies). Betty C. Jung, RN, MPH, CHES . Learning Objectives. To understand: Demographic studies Overview of mortality statistics Mortality Studies
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Betty C. Jung, RN, MPH, CHES
Elements of mortality rate:
Specifically defined population group - (denominator)
Number of deaths occurring in that population group during that time period (numerator)
Total # death during a specified 12 mth period x1000
# persons in the population in the middle of period
Numerator of the rate is the number of deaths that occurred in the specified population and the denominator is obtained either from a census or form estimates of that population;
The numerator & denominator are related to each
other in that the numerator represents those individuals
who died, and the denominator are those who were at risk
In terms of a single year and a population of 1000.
Unit of time must be specified.
Can be made explicit for characteristics, i.e., age, gender, marital status, ethnicity and specific causes.
There is no system for gathering information for all pregnancies - the closest useful measure is the number of live births.
Denominator does not include all pregnancies, but number of live births